Does anybody know why Bulma has purple hair in the Манга but blue hair in the anime?

my guess is that in the manga, they wanted her to have purple hair, and when they looked at it in the anime, they decided that blue might be better to go with. that is my opinion. i have been curious about that too.

I have some pages in the Манга colored by Toriyama and I can say that there are many Цвета that do not match the anime, probably the TOEI Анимация had decided to change them because with the original colours the Аниме would have an older look. For example nam have a розовый dress in Манга :)

Blue hair